Riveting gun



J. F. HAMLIN ETAL 2,909,302

RIV'ETING GUN 2 Sheets-Sheet 1 Filed Feb. 1, 1956 IN V EN TORS JERRY EHAML //V LOU/S NEWMAN A TTORNEY li k Oct. 20, 1959 J. F. l- -lAMLlN ETAL2,909,302

RIVETING GUN Filed Feb. 1, 1956 2 Sheets-Sheet 2 JERRY F HAMLIN ATTORNEYLOU/S NEWMAN United States at n e RIVETlNG GUN Jerry F. Hamlin, SanRafael, and Louis Newman, Oakland, Calif., assignors, by mesneassignments, of onesixth to Jerry F. Hamlin, one-sixth to Bess E.Hamlin, one-sixth to Ralph M. Cuykendall, and one-sixth to MarieCuykendall, all of San Francisco, Calif., onesixth to Louise Newman andone-sixth to Louis New man, both of Oakland, Calif.

Application February 1', *1956, Serial No. 562,793

3 Claims. (Cl. 218-34) The principal object of this invention is toprovide a riveting gun which handles a plurality of rivets in a simple,effective manner, and which plurality of rivets is strung on a holder orwire in series relation so that the plurality can be inserted into anopen slot extending across a surface of the tool.

Another object of the invention is to provide in a riveting gun animproved form of rivet follower which facilitates manual feeding of therivets.

Another object of the invention is to provide a riveting gun having anadvantageous adjustment means for accommodating diiferent lengths ofrivets.

Other objects and advantages of the invention will be apparent from thefollowing description of a preferred embodiment, taken in connectionwith the accompanying drawings, in which:

Figure 1 is a plan view of the riveting gun.

Figure 2 is a longitudinal vertical sectional view through the gun.

Figure 3 is a detail section taken in a plane indicated by the line 3-3in Figure 2.

Figure 4 is a side elevational view of the gun.

Figure 5 is a fragmentary plan view of the jaw end of the gun.

2,909,302 Patented Oct. 20, 1959 i 2 that the rivet gun be easilyadjusted to handle different lengths of rivets.

Referring to Figures 1 through 4 there is shown a riveting gun for blindrivets embodying the invention including a main casting or body 20having a handle portion 21 and an upper elongated barrel portion 22, thebarrel portion 22 being slotted at the top throughout its length toprovide a longitudinal slot 23 therein for a purpose later described.Intermediate its length, the horizontal portion of the body is centrallyslotted at 24 (Fig. 2) entirely through the body portion to receive anoperating trigger 26 which is pivoted at 27 between the two side wallsdefining the slot 24. The trigger 26 has a roller 28 journaled on a pin29 carried by the trigger. The trigger 26 is urged by a leaf spring 30to cause the roller ,to engage a cam surface 31 of an operating lever32. The lever 32 'is pivotallydisposed within a slot 36 in the front ofhandle portion 21 by a pivot 34 extending through the handle portion.The lower rear end portion of lever 32 engages a tapered stop screw 37,having a locking nut 38 associated therewith. By adjusting the screw 37the extent of throw of lever 32 in relation to the operating of thehandle 26 can be controlled for different size rivets. The screw 39provides an adjustable stop for rearward movement of the upper end ofthe lever 32.

At its upper end the operating lever 32 (Figs. 1 and 2) is forked at 41to provide an upwardly opening recess in its upper end. Such upper endengages an end 42 of an operating slide 43 (Figs. 1, 2 and 3) which iscircular in form and has a slot 43' in its upper surface extendingthroughout its length and registering with the slot 23 in the barrelportion 22 of the body of the tool. The slide Figure 6 is a view similarto Figure 5 but illustrating the opening of the jaws during feeding of arivet.

Figure 7 is a view similar to Figures 5 and 6, showing the rivetinserted in two pieces of metal while still on the gun and ready for ariveting operation.

Figure 8 is a view similar to Figure 7 showing the rivet at the end ofthe upsettingoperation.

Figure 9 is an enlarged sectional view showing the rivet in place afterbeing upset. I

Figure 10 is a detailed view of avrivet assembly ready for installationin the gun.

Figure 11 is a view similar to Figure 9 showing a rivet before upsettingthereof.

Fig. 12 is a vertical section taken on the line 12-12 of Fig. 2.

In certain types of blind riveting operations, it is customary to inserta rivet of the hollow type through aligned apertures in a pair of sheetmembers to be riveted together, and then expand the rivet by drawingthrough the rivet an enlarged head on the end of a mandrel so that theblind end of the rivet is expanded to secure the members together. Inthis type of operation it is extremely desirable that the rivets beloaded easily in the gun, be fed easily therefrom in placing a rivet inposition on the tool for riveting operation, and

43 slides in the rear portion of a bore 44 (Fig. 3) in the barrelportion 22 of the body 20. As shown in Fig. 3, the slot 23 forms alongitudinally extending opening into the bore.44 throughout the lengthof the bore 44 and also forms an upper continuation of the slot 43' inthe slide 43 throughout the length of the slot 43'. A depending pin 46on the slide 43 extends downwardly through a guide slot 45 and engages aspring 47 which at its other end abuts an adjustable stop 40 (Fig. 2)threaded into the rear portion of the body portion 20 and accessiblethrough an opening 48 in a guide bracket 51 secured to the body 20 andengaging the slide 43 by means of opposite upwardly projectingguideportions 52.

At the front or jaw end of the tool, a jaw slide and support 61 (Figs. 1and 2) is mounted for sliding movement in a forward portion of the bore44 extending through a guide portion 62 forming the forward part of thebarrel portion, which guide portion also has the slot 23 extending alongin its upper surface and forming a longitudinally extending opening intosuch bore. This jaw slide 61 carries a depending pin 63 which extendsdownwardly into-a guide slot 60 and is engaged by a spring 64 which alsoengages a stop screw 66 and constantly urges the jaw slide 61rearwardly. The jaw slide 61 terminates at its front end in upper andlower plate portions 67 and 68, respectively, in which the jaws 69 arepivoted by means of pins 71. As seen in Figures 1 and 2 the upperportion of the jaw slide 61 is provided with a slot 68' for a portion ofits length registering with the slot 23 in the barrel portion 22 tocontinue the slotted upper surface of the tool.

Referring to Figure 1 it will be noted that the inner surface of eachjaw member 69 is recessed throughout its length so that the two jawmembers 69 provide a passage through the jaws which terminates inrespective cam surfaces 69a leading to a smaller opening in the endfaces 69]: of the jaws. The rear face 690 of each jaw normally abuts theend surface of the barrel portion 22, as shown urgency of the spring 64,shown in Figure 2, and in this position the jaws are closed. As will belater described in detail, movement of the slide 61 and the jaws 69 tothe left in Figures 1 and 2 will free the jaws for floating pivotalopening movement whenever pressure is applied to the slide of the jaws.

Cooperating with the gun and adapted to be installed therein is a rivetassembly including a wire or mandrel 81 (Figures 1, 2, 4 and 10) havinga series of hollow rivets 82 freely slidable thereon and having a rivetretaining shape forming a permanent part of the mandrel such as an upsetportion 83 at the end thereof. The end having such upset portion isadapted to be clamped in the operating slide 43 of the tool or gun bymeans of a set screw 84 threaded into an enlarged slotted end fitting 85of the slide 43, as seen in Figure 1. At its other end the wire 81 has atapered head or cam end 86 which is of a dimension to retain the rivets82 on the wire and which increases in diameter toward the end of thewire. The head 86 can be pulled through the rivets on the mandrel toexpand such rivets.

Also strung upon the wire 81 and freely removable therefrom is a tubularrivet follower 88 (Figures 1 and 2) having a handle portion 87projecting upwardly through the slot 23 in the tool. The feed orfollower member 88 is used with successive wire and rivet assemblies,the aperture therein being large enough to fit over the enlarged ends ofthe wire 81.

To insert the wire and rivet assembly into the tool, it is presentedhead end foremost to the interior of the hollow jaws 69, and thendropped into the slot 23 extending through the length of the gun or tooland thereby also into registering slots 68' and 43 in the slides 61 and43, respectively, and secured in place by means of the set screw 84.Preferably the tapered or rivet upsetting end 86 of the wire 81 isspaced from the end faces 69b of the jaws 69 a sufficient amount toallow for one rivet 82 on the projecting portion of the wire. When thewire and rivet assembly is first placed in the tool the end-most rivet82 to the left in Figure 5 is positioned adjacent the inner cam surfaces69a, and by employing the follower or feeding member 88 to applypressure to the series of rivets 82 on the wire 81, the end-most rivet82, working against the inner cam surfaces 69a of the jaws, will causethe jaw slide 61 to move outwardly, thus causing the jaws 69 to open topass one rivet through (Figure 6) in position to be riveted as shown inFigures 1 and 2. The end faces 6% of the jaws 69 serve as an abutmentfor the head of the rivet.

The operation of the feeding of the rivets is illustrated for example inFigure 6, this view showing the rivet just before it is moved into theriveting position shown in Figure 7 where the rivet has been insertedinto the aligned apertures in two adjacent members 91 and 92 which areto be riveted. Operation of trigger 26 causes the operating lever 32 topivot clockwise in Fig. 2, and to move the slide 43 for the extentrequired to pull the rod 81 so that the tapered end 86 of therivet-holding wire or mandrel 81 is drawn through the rivet and upsetsor expands the rivet to the condition shown generally in Figure 8.Referring to Figure 11 it will be noted that the rivet 82 beforeexpansion has two internal diameters, the larger diameter being of asize to cause the desired expansion within the members 91 and 92. Thesmaller internal diameter of the rivet provides material at 82a forupsetting into overlapping relation with the member 92 as seen in Figure9. Figure 9 shows an enlarged view of a rivet when expanded or upset inthe riveting operation. Upon release of the trigger 26, the spring 47returns the slide 43, lever 32 and trigger 26 to the position shown inFig. 2. The feeding member 87 is then again manually actuated to feedanother rivet through the jaws 4 69 and the tool is conditioned foranother riveting operation.

While we have shown and described certain preferred embodiments of theinvention, it will be apparent that the invention is capable ofvariation and modification from the form shown so that the scope thereofshould be limited only by the scope of the claims appended hereto.

We claim:

1. A riveting gun including a body member, a jawcarrying elementslidably mounted in said body member, a pair of jaws pivotally mountedon said element, means attached to said body member for normally urgingsaid element in one direction, an operating member slidably mounted insaid body member in spaced relation to said element, means normallyurging said operating member in a contra direction to said element, andan actuating lever pivotally attached to said body member and engageablewith a portion of said operating member for moving the latter in anopposite direction, said actuating lever having a cam surface, amanually actuatable lever pivoted to said body member, said manuallyactuatable lever having a roller for engaging said cam surface, saidbody member, said element and said operating member havinglongitudinally extending openings aligned with each other through whichan elongated assembly of rivets may be inserted.

2. A tool for receiving a plurality of hollow rivets strung on a mandrelhaving a rivet expanding head at the forward end of the assembly of saidrivets and said mandrel and for expanding said rivets by pulling saidhead through individual rivets, said tool comprising an elongated bodyportion, a jaw structure mounted on one end of said body portion andhaving openable rivet-headabutting jaws, said body portion having anopen-ended longitudinal groove extending rearwardly from said jawstructure and opening to the outside of said tool for receiving anintermediate portion of said assembly, said jaw structure having alongitudinally extending passageway extending forwardly of the forwardend of said groove for receiving the forward portion of said assembly, amandrel clamping structure mounted on the other end of said body portionfor movement longitudinally of said body portion and having mandrelclamping means movable between an open position and a mandrel grippingposition, said mandrel clamping structure providing an opening extendingrearwardly of the rear end of said groove for receiving the rear end ofsaid mandrel when said clamping means is in said open position, saidgroove and passageway providing for inserting the forward end of saidassembly into said groove adjacent said jaw structure and then throughsaid passageway, said groove and opening having an unobstructed lengthextending from the rear of said passageway providing for unobstructedmovement of the remainder of said assembly into said groove and opening,means to move said clamping means to said gripping position, means forfeeding rivets along said mandrel through said jaws, and means to movesaid clamping structure longitudinally of said body portion away fromsaid jaw structure to' pull said head of said mandrel through a rivetretained in position by said jaws.

3. A tool for receiving a plurality of hollow rivets strung on a mandrelhaving a rivet expanding head at the forward end of the assembly of saidrivets and said .mandrel and for expanding said rivets by pulling saidhead through individual rivets, said tool comprising an elongated bodyportion, a jaw structure mounted on one end of said body portion andhaving openable rivet-headabutting jaws, said body portion having anopen-ended longitudinal groove extending rearwardly from said jawstructure and opening to the outside of said tool for receiving anintermediate portion of said assembly, said jaw structure having alongitudinally extending passage way extending forwardly of the forwardend of said groove for receiving the forward portion of said assembly, amandrel clamping structure slidably mounted on the other end of saidbody portion for sliding movement longitudinally of said body portionbetween a forward position and a rearward position and having mandrelclamping means movable between an open position and a mandrel grippingposition, said mandrel clamping structure providing an opening extendingrearwardly of the rear end of said groove for receiving the rear end ofsaid mandrel when said clamping means is in said open position, saidgroove and passageway providing for inserting the head end of saidassembly into said groove adjacent said jaw structure and then throughsaid passageway, said groove and opening having an unobstructedlengthextending from the rear of said passageway providing forunobstructed movement of the remainder of said assem bly into saidgroove and opening, means to move said clamping means to said grippingposition, means for feeding rivets along said mandrel through said jaws,means to slide said clamping structure longitudinally of said bodyportion away from said jaw structure to said rearward position to pullsaid head of said mandrel through a rivet retained in position by saidjaws, and resilient means for returning said clamping structure to saidforward position.

References Cited in the file of this patent UNITED STATES PATENTS FranceJan. 30, 1954

